Microsoft Word - LIBS_TASK OIGSCHEM 06_0620_02 2004.doc

Centre Number Candidate Number NameUNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary EducationCHEMISTRY 0620/02Paper 2Candidates answer on the Question Paper. No Additional Materials required.

May/June 20041 hour 15 minutesREAD THESE INSTRUCTIONS FIRSTWrite your Centre number, candidate number and name on all the work you hand in. Write in dark blue or black pen in the spaces provided on the Question Paper.You may use a pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, highlighters, glue or correction fluid.

Answer all questions.The number of marks is given in brackets [ ] at the end of each question or part question. A copy of the Periodic Table is printed on page 16.

If you have been given a label, look at the details. If any details are incorrect or missing, please fill in your correct details in the space given at the top of this page.Stick your personal label here, if provided.For Examiners Use

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IB04 06_0620_02/2RP

This document consists of 16 printed pages. UCLES 2004 [Turn overwww.xtremepapers.net21 The diagram shows models of various structures,

ForExaminersUse

ABCDEF(a) Which three of the structures A to F represent elements? Give a reason for your answer. structures

reason[2](b) Which one of the structures A to F represents a gas containing single atoms?[1](c) (i) Which one of the structures A to F represents a gas containing diatomic molecules?

(ii) State the name of a gas which has diatomic molecules.

(d) (i) Which one of the structures A to F represents graphite?

[2]

(ii) State one use of graphite.

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3(e) Structure D represents a compound.

ForExaminersUse(i) State what is meant by the term compound.

(ii) Which one of the following substances is structure E most likely to represent?Put a ring around the correct answer.ammoniahydrogen chloridemethane water[2](f)Hydrogen chloride is a compound.(i) Draw a diagram to show how the electrons are arranged in a molecule of hydrogen chloride.Show only the outer electrons.

show hydrogen electrons as show chlorine electrons as x[2]

(ii) State the name of the type of bonding present in hydrogen chloride.[1](iii) Hydrogen chloride dissolves in water to form an acidic solution (hydrochloric acid).Describe how you would use litmus paper to show that this solution is acidic.

[2](iv) Which one of the following values is most likely to represent the pH of a dilute solution of hydrochloric acid?Put a ring around the correct answer.pH 2 pH7 pH10 pH14 [1] UCLES 2004 06201021M1J104[Turn overwww.xtremepapers.net4(v) Complete the following equation for the reaction of hydrochloric acid with magnesium.Mg(s) + HC1 (aq) MgC12(aq)+ H2(g) [1](vi) Name the salt formed in this reaction.[1] UCLES 200406201021M1J104www.xtremepapers.net

ForExaminersUse52 Two of the stages in water purification are filtration and chlorination.The diagram below shows a filter tank.

ForExaminersUseimpure water instonessandwater out(a) Explain how this filter helps purify the water.

(b) (i) Why is chlorine added during water purification?

[2]

(ii) After chlorination, the water is acidic. A small amount of slaked lime is added to the acidic water. Explain why slaked lime is added.

(iii) What is the chemical name for slaked lime?

(iv) State one other use of slaked lime.[4] UCLES 2004 06201021M1J104[Turn overwww.xtremepapers.net6(c) (i) State the boiling point of pure water.

ForExaminersUse

(ii) Describe a chemical test for water.

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test [1]

result [1](iii) State one use of water in the home.[1](d) The diagram shows the arrangement of particles in the three different states of water.

ABCWhich of these diagrams, A, B or C, shows water in a solid state?[1](e) Steam reacts with ethene in the presence of a catalyst. Complete the word equation for this reaction.ethene+ steam [1]

(f)Potassium reacts violently with water. Complete the word equation for this reaction. potassium+ water +[2] UCLES 2004 06201021M1J104

www.xtremepapers.net73 When Iumps of caIcium carbonate react with hydrochIoric acid, carbon dioxide gas is reIeased.CaC03(s) + 2HC1(aq) CaC12(aq)+ C02(g)+ H20(I)(a) Describe a practicaI method for investigating this reaction, which wouId enabIe you to caIcuIate the rate of reaction.

ForExaminersUse

(b) What effect wiII the foIIowing have on the rate of the reaction?(i) increasing the temperature

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(ii) adding water to the acid

(iii) using powdered caIcium carbonate instead of Iumps

(c) Describe a test for caIcium ions. resuIttest

[3]

[3] UCLES 2004 06201021M1J104[Turn overwww.xtremepapers.net8(d) CaIcium can be obtained by the eIectroIysis of moIten caIcium chIoride.(i) Suggest why caIcium must be extracted by eIectroIysis rather than by reduction with carbon.[1](ii) Draw the eIectronic structure of an atom of caIcium.[2]

ForExaminersUse UCLES 2004 06201021M1J104

www.xtremepapers.net94 0rganic substances have many uses.

ForExaminersUse(a) Match the substances in the boxes on the Ieft with the descriptions in the boxes on the right. The first one has been done for you.methane

liquid used as a solventethanol

used for making roadsethene

gas used as a fuelbitumen

gas used in making polymers[3](b) Which one of the foIIowing wouId be Ieast IikeIy to be obtained from the fractionaIdistiIIation of petroIeum? Put a ring around the correct answer.bitumenethane ethanolmethane[1] UCLES 2004 06201021M1J104[Turn overwww.xtremepapers.net10(c) Some reactions of organic compounds are shown beIow.

ForExaminersUseAn CH2=CH2BC3H8 + 5O2CC6H12O6glucoseDC8H18

( CH2CH2 ) n3CO2 + 4H2O2CO2 + 2C2H5OHC6H14 + C2H4(i) Which one of the reactions, A, B, C or D, shows fermentation?

(ii) Which one of the reactions, A, B, C or D, shows poIymerization?

(iii) Which one of the reactions, A, B, C or D, shows combustion?

(iv) Which one of the reactions, A, B, C or D, shows cracking?

(d) The hydrocarbon C8H18 is an aIkane.(i) What is meant by the term hydrocarbon?

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(ii) ExpIain why this hydrocarbon is an aIkane.

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115 Look at the Iist of five eIements beIow.

ForExaminersUseargon bromine chlorine iodine potassium(a) Put these five eIements in order of increasing proton number.

(b) Put these five eIements in order of increasing reIative atomic mass.

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[1](c) The orders of proton number and reIative atomic mass for these five eIements are different. Which one of the foIIowing is the most IikeIy expIanation for this?Tick one box.The proton number of a particuIar eIement may vary.The presence of neutrons.The atoms easiIy gain or Iose eIectrons.The number of protons must aIways equaI the number of neutrons.

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(d) Which of the five eIements in the Iist are in the same group of the Periodic TabIe?

(e) (i) From the Iist, choose one eIement which has one eIectron in its outer sheII.

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(ii) From the Iist, choose one eIement which has a fuII outer sheII of eIectrons.

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[1] UCLES 2004 06201021M1J104[Turn overwww.xtremepapers.net12(f)Which two of the foIIowing statements about argon are correct?Tick two boxes.Argon is a nobIe gas.

ForExaminersUseArgon reacts readiIy with potassium.Argon is used to fiII weather baIIoons.Argon is used in Iight buIbs.[2](g) Potassium chIoride can be made by reacting potassium with chIorine. The bonding in potassium chIoride is ionic.What does this information teII you about(i) the boiIing point of potassium chIoride,[1](ii) the eIectricaI conductivity of moIten potassium chIoride?[1](h) Describe the change in the eIectronic structure of potassium and chIorine atoms when they combine to make potassium chIoride.change in potassium atom

change in chIorine atom

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136 Iron is extracted from its ore in a bIast furnace using carbon (coke) as a reducing agent and as a source of heat.(a) The coke burns in hot air. The equation for this reaction is2C(s) + 02(g) 2C0(g)State the name of the gas produced in this reaction.[1](b) Near the top of the bIast furnace, the iron(III) oxide in the iron ore gets reduced to iron.Fe203(s)+ 3C0(g) 2Fe(I) + 3C02(g)Use the equation to expIain why the change of iron(III) oxide to iron is a reduction reaction.[1](c) In the hottest regions of the furnace, iron(III) oxide is reduced by carbon.CompIete the equation for this reaction.Fe203(s)+ C(s) Fe(I) + 3C0(g)[2]

ForExaminersUse

UCLES 2004 06201021M1J104[Turn overwww.xtremepapers.net14(d) The iron from the bIast furnace contains up to 10% by mass of impurities. The main impurities are carbon, siIicon and phosphorus. The diagram beIow shows one method of making steeI from iron.

ForExaminersUseoxygen and powdered basic oxidesslag formingmolten iron from blast furnaceA mixture of oxygen and basic oxides is bIown onto the surface of the moIten iron.(i) What is the purpose of bIowing oxygen onto the moIten iron?

(ii) A Iarge amount of energy is reIeased in the process of steeImaking.What name is given to chemicaI reactions which reIease energy?

[1]

[1](iii) The basic oxides react with the impurities in the iron and form a sIag. What information in the diagram suggests that the sIag is Iess dense than the moIten iron?[1](iv) Which one of the foIIowing is a basic oxide?Put a ring around the correct answer.calcium oxidecarbon dioxidesulphur dioxidewater[1](v) Why is steeI rather than iron used for constructing buiIdings and bridges?[1] UCLES 2004 06201021M1J104

www.xtremepapers.net15(e) SpeciaI steeIs contain added eIements such as vanadium, chromium, cobaIt or nickeI.These are aII transition metaIs.State three properties of transition metaIs which are not shown by non-transition metaIs.1.2.3. [3]

(f)What is the name given to metaIs which are mixtures of more than one metaI?[1] UCLES 2004 06201021M1J104

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ForExaminersUseDATA SHEETThe Periodic Table of the ElementsGroup

IIIIIIIVVVIVII0

1HHydrogen14HeHelium2

7LiLithium39BeBeryllium411BBoron512CCarbon614NNitrogen716OOxygen819FFluorine920NeNeon10

23NaSodium1124MgMagnesium1227AlAluminium1328SiSilicon1431PPhosphorus1532SSulphur1635.5ClChlorine1740ArArgon18

39KPotassium1940CaCalcium2045ScScandium2148TiTitanium2251VVanadium2352CrChromium2455MnManganese2556FeIron2659CoCobalt2759NiNickel2864CuCopper2965ZnZinc3070GaGallium3173GeGermanium3275AsArsenic3379SeSelenium3480BrBromine3584KrKrypton36

85RbRubidium3788SrStrontium3889YYttrium3991ZrZirconium4093NbNiobium4196MoMolybdenum42TcTechnetium43101RuRuthenium44103RhRhodium45106PdPalladium46108AgSilver47112CdCadmium48115InIndium49119SnTin50122SbAntimony51128TeTellurium52127IIodine53131XeXenon54

133CsCaesium55137BaBarium56139LaLanthanum57*178HfHafnium72181TaTantalum73184WTungsten74186ReRhenium75190OsOsmium76192IrIridium77195PtPlatinum78197AuGold79201HgMercury80204TlThallium81207PbLead82209BiBismuth83PoPolonium84AtAstatine85RnRadon86

FrFrancium87226RaRadium88227AcActinium89

*58-71 Lanthanoid series90-103 Actinoid seriesaKeyXb

a = relative atomic massX = atomic symbolb = proton (atomic) number

The volume of one mole of any gas is 24 dm3 at room temperature and pressure (r.t.p.).

140

Ce

Cerium

58141

Pr

Praseodymium

59144

Nd

Neodymium

60

Pm

Promethium

61150

Sm

Samarium

62152

Eu

Europium

63157

Gd

Gadolinium

64159

Tb

Terbium

65162

Dy

Dysprosium

66165

Ho

Holmium

67167

Er

Erbium

68169

Tm

Thulium

69173

Yb

Ytterbium

70175

Lu

Lutetium

71232

Th

Thorium

90

Pa

Protactinium

91238

U

Uranium

92

Np

Neptunium

93

Pu

Plutonium

94

Am

Americium

95

Cm

Curium

96

Bk

Berkelium

97

Cf

Californium

98

Es

Einsteinium

99

Fm

Fermium

100

Md

Mendelevium

101

No

Nobelium

102

Lr

Lawrencium

103

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UCLES 2004

University of Cambridge International Examinations is part of the University of Cambridge Local Examinations Syndicate (UCLES) which is itself a department of the University of Cambridge.

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